nav {
    background-color: #333;
    overflow: hidden;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

nav ul li {
    float: left;
}

nav ul li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

nav ul li a:hover {
    background-color: #111;
}

.image-container {
    position: relative;
    width: 100%;
    height: 400px;
}

.image-container img {
    width: 100%;
    height: 400px;
    transition: height 5s ease;
}

.image-container button {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 10px 20px;
    cursor: pointer;
}